3D anisotropic post stack imaging on an offshore africa case study

摘要

Seismic anisotropy may degrade the quality of seismic images and cause the mispositioning of events within them. Shales have often been observed to be significantly anisotropic, usually with approximately hexagonal symmetry (transverse isotropy) with axis normal to the bedding plane. We investigate the effect of anisotropy on imaging a real data set form offshore Africa, where there are thick shale sequences. We perform, in parallel, isotropic and anisotropic velocity model building and 3D post-stack migration of the same stack volume.